FIELD: methods for preparation of vanadium oxide-phosphoric acid catalyst. SUBSTANCE: method consists in mixing of vanadium (v) oxide with aqueous solution of phosphoric acid in stoichiometric quantities with addition of silica get with surface of 100-200 sq.m/g in the amount not exceeding 20 mas.% of the mass of vanadium oxide-phosphoric acid composition and subsequent extrusion of formed paste. Introduced at the mixing stage is aqueous solution of alcohol in the amount of 6-16% of the mass of vanadium oxide-phosphoric acid composition and addition of chromium in form of chromium (III) phosphate. Extrudates are calcinated at 200-300 C. EFFECT: higher efficiency. 8 cl, 1 tbl
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